Stove



B. B. KAHN March 16, 1937.-

STOVE Filed July 17, 1931 4 Shets-Sheet 1 March 16,1937. B. B. KAHN I 2073, 6

STOVE Filed July 17, 1951 4 Sheets-Sheet 2 March 16, 1937. B. B. KAHN 2,073,966

STOVE Filed July 1'7, 1931 4 Sheets-Sheet 4 gwwntoz Patented Mar. 16, 1937 Bertrand B. Kahn, The Estate Stove corporation of Ohio Cincinnati, Ohio, assignor to Com D lly, Hamilton, Ohio, a

Application July 17, 1931, Serial ,No. 551,401 4 Claims. 01. 158-115) This invention relates to-stoves.

One of the principal objects of the invention is the provision of a stove comprising an assembly of parts which may be inexpensively fabricated,

5 readily assembled and accurately maintained in proper operating position, and in which those parts that are a determining factor in maintainis positioned so that the wall portion is of the oven enclosing housing I6 serves as a dividing wall between the oven and the'cooking top. Fuel is ing a high operating efiiciency in the stove are readily accessible and are easily removable to 10 encourage frequent cleaning.

Another object of the invention is the provision in a stove of a burner lighter mechanism comprising but few parts of simple construction andassociated with a normally burning pilot light to provide for automatic ignition of the several burners upon admitting fuel thereto.

Another object of the invention is the provision in a stove having a normally burning pilot and a thermostatically controlled burner, of a secondary pilot which is automatically ignited from the normally burning pilot upon admission of fuel to the burner, the secondary pilot remaining ignited at all times that fuel is available for the burner.

will be apparent from the following description.

the accompanying drawings and the appendedclaims.

In the drawings, which illustrate preferred embodiments of the invention- Fig. l is a fragmentary plan view of a stove constructed inaccordance with this invention; some of the parts being broken away for clearness of illustration;

Fig. 2 is'a sectional view taken on the line 2--2 of Fig-1; I

Fig.3 is a sectional view taken on the line 3-3 of Fig. 1;

Fig. 4A is a sectional view taken on the line l-lof Fig.1;

Fig. 5 is asectional view taken on the line .B-"S of Fig. 4

Fig. 6 is a sectional view of Fig. 3';

taken on the line 66 somewhat different arrangement of parts; and Fig. 8 is a sectional view takenon the line 88 of Fig. 7.

The drawings, in which like characters of reference designate like parts throughout the several views thereof, illustrate a cooking stove which comprises generally a cooking top .lll having associated therewith a plurality of cooking top burners II. and an oven compartment i3 which Other objects and advantages of the invention supplied to the various I] to which suitable burners from a manifold control handles I8 by which the flow of fuel to the cooking top burners H may be regulated. A valve 20, having an operating handle 2|, is connected to the manifold for the supply of fuel to the oven burner I 4.

The cooking top lil is formed of a single sheet metal member which isattached to the stove body ll. As shown, the cooking top is in the form of a rim or frame having an outer portion 25 extending therefrom as a down turned flange. The inner side of the frame, that side opposite to the flange 25, is depressed to form a seat 26 for reception of the grill 24 which serves tosu'pport vessels and other objects which are to be positioned over the burners II. Continuing from the depression 28 is a downwardly and inwardly extending flange 21 which terminates in an inner edge 28 that serves to define the opening in which the burners H are positioned.

Burner supporting means in the form of spaced parallel bars 30 are attached to the cooking top flange for reception of the cooking top burners. As shown, the bars 30 are formed of sheet metal and are of channel shape; the web 3| of each member being positioned "horizontally while the 'Fig. '7 is a fragmentary plan view showing a 5 is provided with an oven burner M. The oven side flanges 32 extend downwardly therefrom.

which are formed to lie in surface contactwith the under side of the flange 21 and are attached thereto as by rivets 34. The bars 30 are provided with spaced holes for the reception of projecting pins which are formed on the burners for their location and attachment to the bars. As shown, each burner H is provided with outwardly projecting arms 36 in which are provided perpendicularly extending projections or pins 31. The pin spacing for all burners is preferably uniform and the supporting bars are interchangeable as they are preferably symmetrical as to hole spacing to permit'of simplicity in assembly of the bars and burners. a

Each of the cooking top burners II has attached thereto a fuel supply tube 39 which provides a passage terminating in a mixing compartment 40 having an opening for reception of a fuel outlet 4| forming part of each fuel supply valve. The fuel outlets 4| are telescopically received within openings of the mixing compartment 40 and thus serve as a third point. of sup valves are attached having 23 and supports a grill 24, and the burners The ends of-each bar have projecting portions 33 port for each burner. Such a burner support provides for ready accessibility of the burners as, to attach a burner, it is merely necessary to insert the fuel outlet 41 within the opening of the mixing compartment and then insert the pins 31 within the holes 48 of the supporting bars 38. The burners II are all of like shape and consequently all have a similar spacing of pins 81. This permits a uniform spacing of pin receiving holes in the bars 38 so that the burners are interchangeably received therein. Each fuel supply tube 39 is shaped according to the positioning of the burner to which it is attached.

A removable pan or tray 46 is positioned beneath the cooking top opening, as defined by the flange edge 28, and serves to catch any foreign matter which may fall through the grill 24. This pan 46, which is supported upon suitable guide members 41 attached to the stove at 48, extends through the stove front at 48and has formed .thereon a closure member 58 in which is provided a handle 5|. When thepan is in position beneath the cooking top the closure 58 serves as a cover for the opening 53 in the stove front through which the pan is withdrawn; the opening 53 being of sufiicient depth to permit the pan to be withdrawn therethrough together with its accumulation of dirt or other foreign matter.

A burner lighter structure is provided for automatic ignition of the cooking top burners II and comprises a normally burning pilot light 55 which is attached to a suppo ing member 56 having oppositely projecting arms 51 which overlie the bars38. The pilot support arms 51 are provided with openings which coincide with openings in the bars 88 for the reception of bolts 58 which serve to securely hold the pilot in fixed position relatively to the supporting bars and the burners attached thereto. That portion of the pilot support adjacent the point of attachment of the pilot is of disk like form and is preferably provided at its rim with an upturned flange 68. Suitable air admission openings 6| may be provided in the plate portion of the disk.

To permit a flow of fuel from each cooking top burner to the pilot for ignition therefrom, each burner II is provided with a jet opening 64 which is directed generally toward the end of a tube 65 respect to the pilot tipi 13 of the flange 69 that when that extends from adjacenteach burner II and terminates adjacent the burner tip of the pilot 55. These tubes all form a unit assembly with the member 61 which connects the tubes adjacent the pilot ends. As shown, the tube assembly is one integrally formed casting in which the central connecting portion 61 is formed as a disk having a central opening 68 and a rim portion in the form of a down turned flange 69; theflange 68 being of similar diameter to the flange 68 of the pilot support. Upon admitting fuel to a burner II, a portion of this fuel flows from the jet opening 64 and through the tube 65 to the pilot 55 for ignition and flash back to the burner. Toproperly locate the tube assembly with respect'to the burner jets 64 and the pilot, each tube 65 is provided with a downwardly extending receive the tube pin projections 18 to thereby accurately locate the tube central opening assembly so that the The faces of the bosses 1| are so related with respect to the lower face the tube assembly is positioned on the bars 38 the flange face 13 68 will stand concentrically with will stand spaced from the upper face 14 of the flange 68 thus providing an opening which, although afiording a restriction to rapid air flow, provides free air supply to the pilot. The ignition tube unit, by being supported entirely from the pins 12 may, like the burners ll, be readily removed by merely lifting the unit from the supporting bars 30. By attaching the burners and burner igniting parts so that they are accessible and readily removable, the frequent removal of these parts for cleaning is encouraged so that the stovemay be maintained at a high degree of operating efficiency.

The fuel supply to.the oven burner I4 has incorporated in it a thermostat whereby the oven may be maintained at a desired temperature. As shown, fuel passing to the oven burner (4 from the supply manifold 11 first passes through the shut-off valve 20 which is under control of the valve handle 2|, then passes through a pipe 16 to a manually adjustable thermostatically operated valve 11, then through a pipe 18 to the oven burner mixer 19. To provide for automatic lighting of the oven burner 14 an ignition tube 88 is provided which extends from adjacent the oven burner structure and terminates adjacent the normally burning pilot 55. The end of this tube ispositioned to receive a flow of fuel from the oven burner structure upon opening of the valve. 28, and to convey this unburned fuel to the pilot 55 for ignition and flash back to the oven burner structure. As shown, this ignition tube 80 is a piece of cylindrical tubing which projects through the oven wall 15 and is further supported from an extending arm 8! of the pilot support 56. The arm-8| is provided with a slot 82 for passage of a screw 83 which is threadedly received within the tube 80; the slot providing for a degree of longitudinal adjustment in' the positioning of the tube. The central connecting disk 61 for the ignition tubes 65 is provided with a hood portion 85 which overlies the pilot end of the tube 80 and serves to direct the fuel flow from the oven burner structure to a point adjacent the burner tip of the pilot 55. If desired, the tube 88 may be provided with a series of openings 86 on the lower side thereof to aid combustion within the tube.

To insure prompt ignition of the oven burner a secondary pilot 81 is provided intermediate the oven burner 14 and the adjacent end of the tube 88. The secondary pilot 81 has its fuel supply interconnected with that of the oven burner, and is provided with jet openings 88 and 89 which are directed respectively toward the tube end and the burner 14 so that upon opening the oven valve 28 fuel may flow from these jets 88 and 89 for ignition of the burner I4. As shown, the pipe 16 connecting the shut-off valve 20 with the oven thermostat 11 is provided with a fitting 90 having a connecting pipe 9| extending to the pilot 81. The pipe 91 is attached to the pilot at a fitting 92 by provision of a union 93. The fitting 92 is in the form of a needle valve having an adjustable member 94 by which the fuel flow to the pilot 81 may be regulated.

The pilot 81 is of tubular form having a bulbous end 96 which stands within the oven compartment and has formed therein the jet openings 88 and 89. The opposite end of the pilot, indicated by the number 91, is exteriorly threaded as indicated at 98, for the reception of an air regulating nut 99 whichmay be moved along the threads to uncover'air openings I00 formed as drilled holes extending radially through the stem end of the pilot. The pilot 81 is of such shape that it may be readily supported in the oven side wall II where it is positioned sufflciently beneath the level of the oven burner l4 and the open end of the tube 80 that the jet openings direct a flow of fuel respectively toward these two members.

The pilot 8'! is mounted within an opening IOI being provided. with of oven wall I5 comprises spaced side plates I02 and I03 having a suitable insulating filling I04 provided therebetween. Axially aligned openings are provided in the oven'walls I02 and I 03 for engagement by the flanges of'the pilot. The opening I05 in the wall I02 is provided of sufficient diameter to admit the rear end of the pilot and is of such size as to engage the annular flange I06 providedadjacent the bulbous end 06. The

opening I08 in the wall I03 is proportioned to pass the threaded stem pilot and to engage the flange I09 which is held in clamped engagement with the wall by provision of a nut I I0. Means are provided to properly locate the pilot relatively to the end of the tube 80 and comprise a forked extension II 2 which projects from the flange I06 and is provided with a yoke like opening of such shape that the tube end may be received therein. A projection II3 stands adjacent the yoke opening to serve as a positioning means for the tube end. By drilling the jet openings 88 and 89 relatively to the yoke opening proper assembly and registration of the jets with respect to he ignition tube and the burner is assured.

As the secondary pilot 8'! receives its fuel supply froma pipe connection the shut-oi! valve and the thermostatically operated valve, the pilot 81 is supplied with fuel at all times that the shut-off valve is open and without regard to positioning of the thermostat or conditions of fuel flowthrough the thermostatispaced flanges for location cally controlled valve. As soon as the shut-off valve is opened fuel issues from the jets 88 and 83 of the secondary pilot ,and, as jet 88 is directed toward the end of tube 80, this tube quickly receives sufllcient fuel to cause ignition and flash back from the normally burning pilot 55 for ignition of the pilot 81. Owing to the rapidity of ignition of the pilot 8'! but little unburned fuel can escape from the oven burner I4 before the jet 83 is burning to ignite this burner.

The pilot 8'! not only provides for initial ignition of the burner I4 but serves also as a constantly burning pilot during all times that the 55 shut-off valve 20 is o en. When the fuel flow to the burner I4 has been materially reduced or h'as been shut oft entirely due to the oven temperature reaching a point at which the thermostat acts to so restrict the fuel flow that the burner may be extinguished, the pilot 8? continues to burn and, through the jet 88, provides a pilot flame in\ intimate contact with the burner I4 for prompt automatic ignition of this burner as soon as fuel issues from its jets.

Referring particularly to Figs. 7 and 8, a somewhat different arrangement of parts is shown in which a fuel supply to the oven burner and to the secondary pilot is controlled from a valve structure wherein by operation of 'a single control may also be adjusted to provide a desired oven temperature. The valve structure, designated generally I23, incorporates a-shut-ofl valve I26 and a thermostatically controlled valve I21, both 7 of which are regulated from a single control which extends through the oven wall; the pilot I and attachment to the wall. As shown, the' communication with the 38 at the rear end of the positioned intermediate handle the supply of fuel may. be regulated, and

a single manipulation of the handle I24 fuel may be supplied to the oven burner I4, and the valve structure may be further adjusted to provide a desired oven temperature. Fuel for the oven burner I4 passes from the manifold II' through a fitting I30 providing a passage to the shut-oil? valve I26 which has a rotatable cored valve plug I3I through which fuel may pass into the body portion I32 of the thermostatically controlled valve I 21. The body of the valve I21 is provided with a valve disk I34 which is movable by a thermostatic element upon temperature change within the oven to regulate the flow of fuel through that valve. An outlet passage .I42 is provided in the body of the thermostatically controlled valve I21 on theopposite side of the valve disk I34 fronfthat which is in shut-oil valve plug I3I. The passage I42 connects with a pipe I43 which terminates in a fuel nozzle I44 for the mixing chamber I3 of the oven burner.

A temperatureresponsive element I35 is provided within the heating zone of the burner I4 and is of such character that it undergoes a change in length as the result of change in the oven temperature. The temperature responsive element is-operatively connected to the valve disk handle m so that by I34 and is also interconnected through gears I36,

I 31 and I38 for adjustment upon movement of the control handle I24 which is' shown provided with an indicating dial I40 that may be calibrated in degrees of oven temperature corresponding to the action of the thermostatic element. The

gearing between the control handle I24 and the temperature responsive element I35 permits an -initial manual setting of the thermostatic element to provide a desired indicated -by the dial I40. Fuel to the oven burner I 4' is then controlled by the valve disc I34 which is automatically regulated by the temperature responsive element in accordance with changes in the oven temperature; the valve disk being oven temperature as always urged toward closed position by provision of a coil spring |4I as shown. The flow of fuel to the oven burner is regulated by the degree of opening of the thermostatically controlled valve disk I34 and consequently if the temperature within the oven compartment should rise an amount sufllcient to cause the valve disk I34 to close entirely the oven burner would then go out even' though the shut-off valve should still be open to admit fuel to the thermostatically controlled valve.

To cause ignition of the fuel at the oven burner I4 upon turning the'valve structure I23 on and to re-ignite the burner upon admission of thereto after closure of the erated valve disc fuel I34,the oven burner is provided with a burner lighter, a secondary pilot, 81' which is ignited from the pilot and remains lighted at all times that the shut off valve I26 is open.

The secondary pilot 81' is interconnected with the oven burner fuel supply in such a manner that fuel is supplied to the secondary pilot at all times that the shut-off valve I26 is open and without regard to the fuel flow through the thermostatically controlled valve which supplies the burner I4. As shown, the secondary pilot 8'! is provided with a fuel supply 9| which connects through a union fitting I8 to a tubular extension I89 from that portion valve housing I21 which is with the shut-oi! valve I28. 3 u

thermostatically opf the thermostat in "communication.

l4 thus facilitating 74% end of. the

The operating connection between the thermostatically actuated valve I21 and the shut-off valve I26 is such that upon moving the control handle I24 from the off position the result of the initial movement is to rotate the gas shutoff valve toward open position, a rotation of approximately 90 being needed for moving the shut-oiI valve to full open position, as shown. The disc I34 is urged to closed position by the spring I and is opened by axial movement of the temperature responsive element I35. The element is threadedly attached to the valve I21 and moves axially upon rotation imparted through the gears I35, I31 and I38 connecting to the handle I24. The relationship between the disc I34 and element I35 is such that the handle may be turned the entiredistance needed for moving the shut-off valve to full open position before the element is moved axially an amount sufllcient to engage and lift the disc I34 thereby opening a passage through the thermostatic valve, and permitting the fuel to flow onward into the burner. Actuation of the valves in succession permits a fuel flow through the shutoff valve to the secondary pilot prior to opening of the disc I34 to supply the burner I4 so that the secondary pilot may be ignited in the time interval prior to admission of fuel to the burner the ignition of gas from the outside pilot and so that there will be no escape of unburned fuel into the compartment enclosing that burner. Like the pilot 81, the pilot 81' has jet openings directed toward the burner so that positive ignition results as soon as fuel issues from the burner jets.

Ignition of the secondary pilot 81' is accomplished by provision of an ignition tube structure extending from adjacent the jet 88' of the secondary pilot and terminating adjacent the normally burning pilot 55 which is shown supported by a plate structure 56' which is carried by the burner supporting bars30'. The pilot support 56 has a disk like central portion bounded by an up-turned flange 60' and has also an extending portion BI slotted at 82' to receive the screw 83' by which the secondary aflixed thereto. As shown, that end of the ignition tube 80' which is remote from the pilot is received in telescopic relationship within the end of a tubular fitting I90 which is fixed to and projects through the oven wall IS; the opposite end of the tubular member I90 opening adjacent the pilot jet 88'. v

Igniting means are provided for the cooking top burners II in the form of an ignition tube assembly which is associated with the pilot 55' to convey fuel flow from the respective cooking top bumers-to the pilot for flash back and consequently ignition. As shown, an ignition tube extends from the pilot toward each burner II; the tubes being joined at the pilot end by provision of a barrel like provided a horizontally positioned baffle I92- having a central opening I93 concentrically related to the burner tip of the pilot 55. The ignition tube assembly is supported upon the bars 30 by provision of spaced pins 10, and by contacting engagement of the faces of downwardly extending bosses which permit the barrel like housing I9I to be located within the confines of the flangeifl' while spaced from the-pilot support 49'. .The' ignition tube unit has formed on it a hood 9! ignition tube and provides pilot ignition tube 80' is i wall from adjacent the oven burner housing II in which is.

which serves as a cover for the adjacent departing from the scope of the invention which is defined in the appended claims.

What is' claimed is:

1. In a stove, cooking top burners, a pilot burner, a common supporting means for said cooking top burners and pilot burner, means for conducting a flow of fuel from said cooking top burners to said pilot for automatic ignition thereby comprising tubes extending from adjacent each cooking top burner and terminating adjacent the pilot, means joining said tubes into a unit assembly, a hood projection on said tube unit assembly, an oven burner positioned remotely from said pilot burner, an ignition tube extending from adjacent said oven burner and terminating short of the pilot burner, means for securing said oven burner ignition tube upon said burner supporting means, and means for removably supporting said cooking top ignition tube unit independently of said pilot and in fixed relationship with the pilot and the oven burner tube with the hood projection of the tube unit overlying the oven tube end.

2. In a stove, a cookingtop and cooking top burners, said cooking top comprising a rim portion, said rim portion having formed therein means for reception of vessel supporting means, an integrally formed depending flange extending downwardly and inwardly from the inner edge of said rim portion and terminating closely adjacent the burners to provide a central opening for insertion and withdrawal of the burners therethrough, and cooking top burner supporting bars permanently attached to the .inner opposite sides of said flange.

3. In a stove, a cooking top and cooking top burners, said cooking top comprising a rim portion having a flange extending therefrom, a pilot burner, attaching means for said burners, supporting means for said burners attached to said flange and comprising a pair of spaced bars having duplicate symmetrically arranged holes formed therein for reception of said burner attaching means. 1

.4. In a stove having a tion between a cooking top and an oven compartment, cooking top burners, a pilot burner, supporting means for said cooking top and pilot burners, an oven burner positioned on the side of the wall remote from the cooking top, a readily removable ignition tube extending through the to the pilot light, means for removably attaching said tube to said burner supportingmeans, a removable ignition tube assembly for said cooking top burners comprising a plurality of joined tubes extending from adjacent the pilot burner to each of said cooking top burners, means on the ignition tube assembly engageable with the burner supporting means to provide a fixed positioning for the tube assembly with respect to said burners, and means on the ignition tube assembly over lying the oven ignition tube to direct fuel .from said oven tube to the pilot, said oven tube being withdrawable from the stove upon removal of the tube assembly and removal of the oven tube attaching means.

wall providing separa- BERTRAND -'B. KAHN. 

